Two easy things to check:
First, find the AC power breaker box and make sure that none of the breakers are tripped.
Second, inspect every outlet and find the one that is GFCI protected. Make sure that the GFCI isn't tripped. Usually there are several outlets downstream from a GFCI outlet, so if the GFCI trips, then you can lose the whole circuit.
Check other items that are "hard wired" into your AC system, for instance, try turning on the fan on your air conditioner (assuming yo have one).
good luck!
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